(CNN) -- No one was arrested or "placed in handcuffs" in connection with a phone call threatening a hijacking of an American Airlines flight in San Francisco, California, police said Thursday.
Earlier, a source familiar with the investigation said that two passengers were being questioned further by authorities.
The threat was called in before the plane departed from San Francisco.
Flight 24, bound for New York's John F. Kennedy Airport, was taken to a remote location and passengers were interviewed and re-screened while local law enforcement officers inspected the aircraft, TSA said.
Randy Cohen, a passenger on the flight, said the people on the plane were calm in general, but that as the time went by on the tarmac, some became nervous.
Even the pilot, when he made an announcement, "you could tell the angst in his voice, and the uncertainty," Cohen said.
Cohen said he saw authorities remove a large garbage bag from an overhead bin in the back of the plane.
Once police arrived, the passengers were removed from the plane, six at a time. CNN
